CVE-2009-4272

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-05-02. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 11%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

A certain Red Hat patch for net/ipv4/route.c in the Linux kernel 2.6.18 on Red Hat Enterprise Linux (RHEL) 5 allows remote attackers to cause a denial of service (deadlock) via crafted packets that force collisions in the IPv4 routing hash table, and trigger a routing "emergency" in which a hash chain is too long. NOTE: this is related to an issue in the Linux kernel before 2.6.31, when the kernel routing cache is disabled, involving an uninitialized pointer and a panic.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
95.5%
KEV
Not listed

Published

January 27, 2010

Last Modified

April 29, 2026

Advisory Details (4)

Auto-updated May 2, 2026
Patch available. Sources: redhat.
generic

IBM X-Force Exchange

https://exchange.xforce.ibmcloud.com/vulnerabilities/55808
redhat Patch Available

545411 – (CVE-2009-4272) CVE-2009-4272 kernel: emergency route cache flushing leads to node deadlock

Affected: Red Hat Enterprise Linux 5

https://bugzilla.redhat.com/show_bug.cgi?id=545411
generic

oss-security - Re: CVE-2009-4272 kernel: emergency route cache flushing leads to node deadlock

http://www.openwall.com/lists/oss-security/2010/01/20/6
generic

oss-security - CVE-2009-4272 kernel: emergency route cache flushing leads to node deadlock

http://www.openwall.com/lists/oss-security/2010/01/20/1

Vendor Advisories for CVE-2009-4272(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhev-hypervisor-0:5.4-2.1.8.el5_4rhev2_12010-02-09redhat
redhatkernel-0:2.6.18-164.11.1.el52010-01-19redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 31× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 14:03 UTCEPSS rescore
  2. 2026-07-21 15:20 UTCEPSS rescore
  3. 2026-07-20 17:03 UTCEPSS rescore
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  10. 2026-07-13 22:25 UTCEPSS rescore
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  20. 2026-06-29 14:02 UTCEPSS rescore
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  1. 2026-06-25 13:46 UTCEPSS rescore
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  3. 2026-06-24 14:02 UTCEPSS rescore
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  5. 2026-06-23 21:29 UTCEPSS rescore
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  7. 2026-06-22 14:22 UTCEPSS rescore
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  18. 2026-06-15 17:44 UTCEPSS rescore
  19. 2026-06-14 23:14 UTCEPSS rescore
  20. 2026-06-14 23:14 UTCEPSS rescore
  21. 2026-06-13 22:57 UTCEPSS rescore
  22. 2026-06-12 23:08 UTCEPSS rescore
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  24. 2026-06-10 22:14 UTCEPSS rescore
  25. 2026-06-10 13:17 UTCEPSS rescore
  26. 2026-06-08 14:13 UTCEPSS rescore
  27. 2026-06-07 15:22 UTCEPSS rescore
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  29. 2026-06-06 13:44 UTCEPSS rescore
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  39. 2026-06-01 13:49 UTCEPSS rescore
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  41. 2026-05-31 22:28 UTCEPSS rescore
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  43. 2026-05-31 00:13 UTCEPSS rescore
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  45. 2026-05-29 13:40 UTCEPSS rescore
  46. 2026-05-29 12:58 UTCEG score recompute
  47. 2026-05-29 12:58 UTCVendor advisory
  48. 2026-05-29 12:57 UTCGHSA enrichment
  49. 2026-05-28 13:42 UTCEPSS rescore
  50. 2026-05-28 13:42 UTCEPSS rescore
  51. 2026-05-28 13:42 UTCEPSS rescore
  52. 2026-05-27 13:38 UTCEPSS rescore
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  54. 2026-05-26 13:41 UTCEPSS rescore
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  56. 2026-05-26 07:16 UTCEPSS rescore
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  58. 2026-05-24 16:43 UTCEPSS rescore
  59. 2026-05-22 21:15 UTCEPSS rescore
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  61. 2026-05-20 22:37 UTCEPSS rescore
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  63. 2026-05-20 11:21 UTCEPSS rescore
  64. 2026-05-20 11:20 UTCEPSS rescore
  65. 2026-05-18 21:29 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2009-4272?
CVE-2009-4272 is a high vulnerability published on January 27, 2010. A certain Red Hat patch for net/ipv4/route.c in the Linux kernel 2.6.18 on Red Hat Enterprise Linux (RHEL) 5 allows remote attackers to cause a denial of service (deadlock) via crafted packets that force collisions in the IPv4 routing hash table, and trigger a routing "emergency" in which a hash…
When was CVE-2009-4272 disclosed?
CVE-2009-4272 was first published in the National Vulnerability Database on January 27, 2010, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-4272 actively exploited?
CVE-2009-4272 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2009-4272?
CVE-2009-4272 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2009-4272?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-4272, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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